What is the focus of managerial epidemiology (individual or population)? Please give me a reason for whether managerial epidemiologists study individuals or communities.

What is the focus of managerial epidemiology (individual or population)? Please give me a reason for whether managerial epidemiologists study individuals or communities. Assuming you determined that the city requires a new health service, how would you go about determining the feasibility of the health service, the outcome measures, the effectiveness, and the return on investment on the potential new health venture? How does managerial epidemiology help with improving the health of populations? What evidence-based approach or process would you use to determine the effectiveness of change or intervention in your organization?